There is widespread misconception that coconut oil is bad for you because it is said to raise blood cholesterol and cause heart disease. The only "proof" is one four-decades old study. The study used hydrogenated coconut oil.

It is now known that the process of hydrogenation creates "trans fatty acids" (TFAs), which are toxic entities that enter cell membranes, block utilization of essential fatty acids (EFAs) and impede cell functionality. TFAs also cause a rise in blood cholesterol. These substances are not present in natural coconut oil.

In other words, a study based on hydrogenated coconut oil has no relevance to the non-hydrogenated coconut milk or coconut oil that you eat.

Widespread studies of coconut-consuming populations such as those found in Polynesia and Sri Lanka, show that "dietary coconut oil does not lead to high serum cholesterol nor to high coronary heart disease mortality or morbidity." Other studies show no change in serum cholesterol level from coconut oil. And if it is true that the herpes virus and cytomegalovirus have a causative role in the initial formation of atherosclerotic plaques, coconut oil may be beneficial in preventing heart disease.